Poly(vinylidene fluoride) derived fluorine-doped magnetic carbon nanoadsorbents for enhanced chromium removal

Abstract

Newly designed fluorine-doped magnetic carbon (F-MC) was synthesized in situ though a facile one-step pyrolysis-carbonization method. Poly(vinylidene fluoride) (PVDF) served as the precursor for both carbon and fluorine. 2.5 % F content with core-shell structure was obtained over F-MC, which was used as a adsorbent for the Cr(VI) removal. To our best knowledge, this is the first time to report that the fluorine doped material was applied for the Cr(VI) removal, demonstrating very high removal capacity (1423.4 mg g-1), higher than most reported adsorbents. The unexpected performance of F-MC can be attributed to the configuration of F dopants on the surface. The observed pseudo-second-order kinetic study indicated the dominance of chemical adsorption for this process. High stability of F-MC after 5 recycling test for the Cr(VI) removal was also observed, indicating that F-MC could be used as an excellent adsorbent for the toxic heavy metal removal from the wastewater.

Pyrolysis of chemically treated corncob for biochar production and its application in Cr(VI) removal

“…The Cr(VI) removal by biochar was higher at lower pH. This is because of the participation of more H 1 ions in the system [52]. The percentage removal of Cr(VI) decreased from 93% to 1.86% as pH increased from 2 to 10 ( Figure 6a).…”

Block Copolymers: Synthesis, Self-Assembly, and Applications

“…This group of materials exhibits periodically aligned structures and uniform cavities with sizes ranging from micro- (<2 nm), to meso- (2–50 nm), to macropores (>50 nm) [ 130 ], which lead to very high surface areas (up to 1500 m 2 /g) [ 131 ]. With these unique features, porous materials present great value for applications in energy conversion and storage [ 132 , 133 , 134 , 135 ], catalysis [ 136 ], drug delivery [ 137 ], gas capture [ 138 , 139 ], and water purification [ 140 , 141 ].…”

Chemical and Morphological Transition of Poly(acrylonitrile)/Poly(vinylidene Fluoride) Blend Nanofibers during Oxidative Stabilization and Incipient Carbonization

“…Due to its good electrochemical stability and affinity to electrolyte solutions, poly(vinylidene fluoride) (PVDF) has recently received significant attention for its potential as a precursor for CNFs and their potential application in lithium-ion batteries [ 59 , 60 , 61 , 62 ]. While Yang et al emphasized the need for low temperature chemical stabilization by dehydrofluorination for the subsequent carbonization of PVDF [ 61 ], other groups have shown that carbonization under a nitrogen atmosphere is possible without additional stabilization [ 59 , 63 , 64 ], suggesting that carbonizing PAN/PVDF may enable creating carbon fibers combining the advantages of both materials. PVDF has also been studied as electrospun blend membrane with PAN [ 65 ].…”